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hello! i test the lisp it is work! thans a lot Best regards, many thanks

If you are happy to pick an attribute directly then can do this. Uses Nentsel rather than entsel. (setq attstr (cdr (assoc 1 (entget (car (nentsel "\nPick attribute "))))))

Can you be more specific? What concepts do you understand, and where are you having trouble? What have you tried, and what happened when you tried it? Do you have to build the corridor from scratch? The assignment is a little vague. When they say "Calculation of Roadway Embankment," do they want cut/fill volumes? What is the slope of the embankment? Where is the right of way, and how are you supposed to deal with it? I would start by reading up on corridors and surfaces, especially volume surfaces. To understand corridors, you'll need to understand alignments and assemblies. Unfortunately, Civil 3D has a rather steep learning curve.